hello,
I'm working with the GSM/GPRS sim900. I want to interface the module with PC. in this
datasheet page 7 & 8 the manufacturer recommanded max3221 i saw too many people saying they used max232 for level adaptation and it worked well for them. i don't understand But the max232 levels is rs232 => TTL/CMOS (5v) and the sim900 cannot communicate with 5V (it communicates with 3V max). how is this possible??? how this could be done without damaging the module ??
Thank you